1157072221 has 2 divisors, whose sum is σ = 1157072222. Its totient is φ = 1157072220.

The previous prime is 1157072197. The next prime is 1157072227. The reversal of 1157072221 is 1222707511.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1134746596 + 22325625 = 33686^2 + 4725^2 .

It is a cyclic number.

It is not a de Polignac number, because 1157072221 - 2⁷ = 1157072093 is a prime.

It is a super-2 number, since 2×1157072221² = 2677632249219745682, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1157072221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1157072227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 578536110 + 578536111.

It is an arithmetic number, because the mean of its divisors is an integer number (578536111).

Almost surely, 2^1157072221 is an apocalyptic number.

It is an amenable number.

1157072221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1157072221 is an equidigital number, since it uses as much as digits as its factorization.

1157072221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1960, while the sum is 28.

The square root of 1157072221 is about 34015.7643012765. The cubic root of 1157072221 is about 1049.8328444416.

Adding to 1157072221 its reverse (1222707511), we get a palindrome (2379779732).

The spelling of 1157072221 in words is "one billion, one hundred fifty-seven million, seventy-two thousand, two hundred twenty-one".